a?.b!.c;
a?.b!.c.d;
a?.b.c!.d;
a!.b?.c;
a?.b!?.c;
a?.b!.c?.c;
(a?.b!).c;
(a?.b)!.c;

a?.().b!.c;
a?.().b!.c.d;
a?.().b.c!.d;
a?.().b!?.c;
a?.().b!.c?.c;
(a?.().b!).c;
(a?.().b)!.c;

(a?.b)![c?.d!]
